/**
 * Software License, Version 1.0
 * 
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 * 
 *
 *Redistribution and use in source and binary forms, with or without 
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the 
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and 
 * wherever such third-party acknowledgments normally appear.
 * 
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering, 
 * shall not be used to endorse or promote products derived from this software 
 * without prior written permission from Indiana University.  For written 
 * permission, please contact the Advanced Research and Technology Institute 
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering, 
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 * 
 *
 * Indiana University provides no reassurances that the source code provided 
 * does not infringe the patent or any other intellectual property rights of 
 * any other entity.  Indiana University disclaims any liability to any 
 * recipient for claims brought by any other entity based on infringement of 
 * intellectual property rights or otherwise.  
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO 
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF 
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS. 
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS", 
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.  
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR 
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION 
 *GENERATED USING SOFTWARE.
 */
package cgl.narada.transport.ptcp.psocket.tools;

/**
 * <p>Title: PTCP Socket</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: Pervasive Labs, Indiana University, Bloomington, IN</p>
 * @author Ali Kaplan
 * @version 1.0
 */
public class PTCPDataFragmentator implements PTCPParameters {
  private PTCPPacket[] packets_ = null;
  private int packet_number_ = -1;
  private String module_name_ = "PTCPDataFragmentator: ";

  public PTCPDataFragmentator() {
  }

  public PTCPDataFragmentator(byte[] data, int connectionNumber) {
    initialize(data, connectionNumber, -1);
  }

  public PTCPDataFragmentator(byte[] data, int connectionNumber, int seq) {
    initialize(data, connectionNumber, seq);
  }

  private void initialize(byte[] data, int connectionNumber, int seq) {
    int packetSize = data.length / connectionNumber;
    int offset = 0;
    packets_ = new PTCPPacket[connectionNumber];
    if (seq != -1) {
      packet_number_ = seq;
    }
    for (int i = 0; i < (connectionNumber - 1); i++) {
      byte[] temp = new byte[packetSize];
      System.arraycopy(data, offset, temp, 0, packetSize);
      offset += packetSize;
      packet_number_++;
      packets_[i] = new PTCPPacket(packet_number_, temp);

    }

    packet_number_++;

    int lastPacketSize = data.length -
                         ( (connectionNumber - 1) * packetSize);
    byte[] temp1 = new byte[lastPacketSize];
    System.arraycopy(data, offset, temp1, 0, lastPacketSize);
    packets_[connectionNumber - 1] = new PTCPPacket(packet_number_, temp1);

  }

  public int getLastPacketNumber() {
    return packet_number_;
  }

  public PTCPPacket[] getPackets() {
    return packets_;
  }

  public static void main(String[] args) {
    String data = "123456789012345678901234567890";
    PTCPDataFragmentator df = new PTCPDataFragmentator(data.getBytes(), 4);
    Object[] packets = df.getPackets();
    System.out.println("No. of packets: " + packets.length);

    for (int i = 0; i < packets.length; i++) {
      System.out.println( (PTCPPacket) packets[i]);
    }
  }
}
